1. 概述

Orika 是一个高效、轻量级的 Java Bean 映射框架，能够自动处理对象之间的属性复制和转换。本文将详细介绍如何在 Spring Boot 项目中集成和使用 Orika。

2. 环境准备

2.1 导入依赖

在项目的 pom.xml 文件中添加 Orika 依赖：

<dependency> <groupId>ma.glasnost.orika</groupId> <artifactId>orika-core</artifactId> <version>1.5.2</version> </dependency>

3. Spring Boot 配置

3.1 创建 MapperFactory 配置类

编写容器注入的类，将 Orika 的 MapperFactory 配置为 Spring Bean：

package com.kingboy.springboot.config; import ma.glasnost.orika.MapperFactory; import ma.glasnost.orika.impl.DefaultMapperFactory; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class MapperFacotoryAutoWire { @Bean public MapperFactory getFactory(){ return new DefaultMapperFactory.Builder().build(); } }

import ma.glasnost.orika.MapperFactory; import ma.glasnost.orika.impl.DefaultMapperFactory; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class OrikaConfig { @Bean public MapperFactory mapperFactory() { MapperFactory factory = new DefaultMapperFactory.Builder().build(); // 全局注册映射规则 factory.classMap(Person.class, Student.class) .field("dateTime", "birth") // 映射不同名的字段 .byDefault() // 其他同名字段自动映射 .register(); return factory; } }

4. 使用示例

4.1 单元测试示例

以下是一个完整的单元测试示例，展示如何使用 Orika 进行对象映射：

import ma.glasnost.orika.MapperFactory; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import java.util.ArrayList; import java.util.Date; import java.util.List; import static org.junit.Assert.*; @RunWith(SpringRunner.class) @SpringBootTest(classes = KingBoyApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT) public class MapperFactoryTest { @Autowired private MapperFactory mapperFactory; /** * 测试单个对象映射 */ @Test public void copyBeanToBean() { // 1. 准备数据 Person person = new Person("king", 123, new Date()); // 2. 执行映射 (无需再次注册，配置类已处理) Student student = mapperFactory.getMapperFacade().map(person, Student.class); // 3. 验证结果 assertNotNull(student); assertEquals("king", student.getName()); assertEquals(Integer.valueOf(123), student.getAge()); assertEquals(person.getDateTime(), student.getBirth()); System.out.println("Single Object Mapping: " + student); } /** * 测试列表映射 */ @Test public void copyListToList() { // 1. 准备数据 List<Person> personList = getPersonList(); // 2. 执行列表映射 List<Student> students = mapperFactory.getMapperFacade().mapAsList(personList, Student.class); // 3. 验证结果 assertNotNull(students); assertEquals(personList.size(), students.size()); // 简单校验第一个元素 Student firstStudent = students.get(0); assertEquals("lucy1", firstStudent.getName()); assertEquals(Integer.valueOf(1), firstStudent.getAge()); // 打印结果 students.forEach(System.out::println); } private List<Person> getPersonList() { List<Person> list = new ArrayList<>(5); Date now = new Date(); for (int i = 1; i <= 5; i++) { list.add(new Person("lucy" + i, i, now)); } return list; } }

5. 实体类定义

5.1 Person 类

源对象 Person 类的定义：

package com.kingboy.springboot.domain; import java.time.LocalDateTime; import java.util.Date; public class Person { public Person() { } public Person(String name, Integer age, Date dateTime) { this.name = name; this.age = age; this.dateTime = dateTime; } private String name; private Integer age; private Date dateTime; public String getName() { return name; } public Person setName(String name) { this.name = name; return this; } public Integer getAge() { return age; } public Person setAge(Integer age) { this.age = age; return this; } public Date getDateTime() { return dateTime; } public Person setDateTime(Date dateTime) { this.dateTime = dateTime; return this; } @Override public String toString() { return "Person{" + "name='" + name + ''' + ", age=" + age + ", dateTime=" + dateTime + '}'; } }

5.2 Student 类

目标对象 Student 类的定义：

package com.kingboy.springboot.domain; import java.time.LocalDateTime; import java.util.Date; public class Student { private String name; private String grade; private Integer age; private Date birth; public Date getBirth() { return birth; } public Student setBirth(Date birth) { this.birth = birth; return this; } public String getName() { return name; } public Student setName(String name) { this.name = name; return this; } public String getGrade() { return grade; } public Student setGrade(String grade) { this.grade = grade; return this; } public Integer getAge() { return age; } public Student setAge(Integer age) { this.age = age; return this; } @Override public String toString() { return "Student{" + "name='" + name + ''' + ", grade='" + grade + ''' + ", age=" + age + ", birth=" + birth + '}'; } }

6. 总结

通过以上步骤，我们成功在 Spring Boot 项目中集成了 Orika 对象映射框架。Orika 提供了灵活的字段映射配置，支持单个对象和集合对象的映射，能够大大简化 Java Bean 之间的属性复制工作。